CN109406317B - Device and method for testing longitudinal tearing strength of film - Google Patents

Device and method for testing longitudinal tearing strength of film Download PDF

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Publication number
CN109406317B
CN109406317B CN201710701960.4A CN201710701960A CN109406317B CN 109406317 B CN109406317 B CN 109406317B CN 201710701960 A CN201710701960 A CN 201710701960A CN 109406317 B CN109406317 B CN 109406317B
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platform
film
test
film sample
jaw
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CN109406317A (en
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谷汉进
王素玉
张丁
钱鑫
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Beijing Yanshan Petrochemical Hi Tech Co ltd
China Petroleum and Chemical Corp
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Beijing Yanshan Petrochemical Hi Tech Co ltd
China Petroleum and Chemical Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/001—Impulsive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0033—Weight
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0278—Thin specimens
    • G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

The invention relates to the field of strength testing devices, and discloses a testing device and a testing method for longitudinal tearing strength of a film. The test device comprises: (i) a base (1); (ii) A test stand (2) perpendicular to the base and fixed to the base (1); (iii) A fixing clamp (3) fixed on the upper part of the test frame (2) and used for fixing the film sample; (iv) A horizontal platform (4) fixed on the test stand (2); and (v) a weight (5) placed on the platform (4). By adopting the technical scheme provided by the invention, the load applied to the film does not need to be calculated, the tearing length of the film when the film is subjected to instantaneous tearing force is only required to be accurately measured, the phenomenon that the film is longitudinally torn under the action of instantaneous external force can be represented, the device is suitable for both soft and hard films, the device structure is simple, and the testing method is simple and easy to implement.

Description

Device and method for testing longitudinal tearing strength of film
Technical Field
The invention relates to the field of strength testing devices, in particular to a testing device for the longitudinal tearing strength of a film and a testing method for the longitudinal tearing strength of the film.
Background
The mulching film product has the main functions of moisture preservation and soil moisture preservation, and the outstanding performance requirement is that the longitudinal tearing performance is good. The longitudinal tearing damage of the mulching film material is a process that under the action of external force (generally under the influence of wind) the film is initiated by initial small holes, cracks or other defects on the film material, and then rapidly expands and leads to the integral damage of the film material.
At present, the prior art mainly comprises a trouser tearing method, an Elmendorf method and a right angle tearing method for testing the tearing performance of the film. The trouser tearing method is to stretch two trouser legs formed by cutting in the long axis direction of the sample, and test the required average force to calculate the tearing strength, but the method needs constant stretching speed and can not represent the phenomenon that the film is torn longitudinally under the action of transient external force; the Elmendorf method utilizes a specified pendulum to tear a notched specimen and displays the consumed energy to calculate the tear resistance, but the method is limited by the pendulum mass, can only test a soft film and cannot test a hard mulching film; the right angle tearing method is used for measuring the tearing load or the tearing strength of a sample by applying a tensile load to the sample with the right angle opening shape, but the sample does not contain a pre-incision, the shape design of the sample and the tearing external force simulation are greatly different from the actual situation, and few people use the method.
Therefore, it is necessary to develop a test device for the longitudinal tear strength of a film.
Disclosure of Invention
The invention aims to overcome the defect that the longitudinal tearing strength of a film cannot be tested in the prior art, and provides a testing device for the longitudinal tearing strength of the film, which comprises:
(i) A base;
(ii) The test stand is perpendicular to the base and fixed on the base;
(iii) The fixing clamp is fixed at the upper part of the test frame and used for fixing the film sample;
(iv) A horizontal platform fixed to the test rack; and
(v) Weights placed on the platform.
The invention also provides a method for testing the longitudinal tearing strength of the film, wherein the method comprises the following steps:
(a) Clamping the film sample on a fixing clamp, clamping a jaw at the position of the mark A, enabling the other end of the sample to drop freely, and enabling the long axis direction of the film sample to be vertical;
(b) Tying left and right membrane strips at the lower end of the film sample to the upper end of the weight along a transverse line at the position marked C;
(c) Simultaneously and instantaneously pushing down the two weights to opposite directions, wherein the time difference between the two weights leaving the platform is not more than 0.5s, and the swing amplitude of the weights after falling is not more than 10 degrees;
(d) Measuring the length of the film sample torn upward from the mark B in cm;
wherein, the positions of the marks A, B and C are positions on the film sample, the position of the mark A is a position clamped by a jaw, the position of the mark B is a starting position of longitudinal tearing, and the position of the mark C is a position fixed to the upper end of the weight.
By adopting the technical scheme provided by the invention, the load applied to the film does not need to be calculated, the tearing length of the film when the film is subjected to instantaneous tearing force is only required to be accurately measured, the phenomenon that the film is longitudinally torn under the action of instantaneous external force can be represented, the device is suitable for both soft and hard films, the device has a simple structure, the testing method is simple and easy to implement, and the device is suitable for mass film longitudinal tearing strength tests, particularly suitable for ultrathin mulching films and has very high use value.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a schematic structural view of a test device for the longitudinal tear strength of a film provided by the invention;
FIG. 2 is a schematic illustration of a film sample subjected to a machine direction tear strength test;
FIG. 3 is a schematic illustration of a test apparatus for testing the longitudinal tear strength of a film with a film sample secured thereto;
fig. 4 is a schematic view of the test device after the weight is pushed down the platform.
Description of the reference numerals
1. Base 2 test stand
3. Fixing clamp 4 platform
5. Weight
Detailed Description
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In the present invention, unless otherwise indicated, the terms "upper, lower, left, right, front, and rear" are used in the sense that the test device for the longitudinal tear strength of a film provided according to the present invention is generally defined under normal use conditions and corresponds to the upper, lower, left, and right directions shown in fig. 1 to 4, and "front" means out of the page and "rear" means in the page.
The invention provides a testing device for the longitudinal tearing strength of a film, wherein the testing device comprises:
(i) A base 1;
(ii) A test stand 2 perpendicular to the base 1 and fixed to the base 1;
(iii) A fixing clip 3 fixed on the upper part of the test stand 2 for fixing the film sample;
(iv) A horizontal platform 4 fixed to the test stand 2; and
(v) A weight 5 placed on the platform 4.
In the present invention, the base 1 provides a fixed function for the whole testing device, so that the whole testing device can be kept vertical and not inclined or overturned in the use or non-use state. The material, size and shape of the base 1 are not particularly limited as long as the above-described functions can be achieved.
In the present invention, the test stand 2 is a function of providing support and connection to the entire test device. The material of the test stand 2 is not particularly limited as long as it is sufficiently strong. The dimensions of the test stand 2 are not particularly limited and may be determined according to the size of a specific film sample to be tested.
According to the present invention, after the test stand 2 is fixed on the base 1, the distance from the top end of the test stand 2 to the upper surface of the base 1 is the height of the whole test device. In the present invention, the height of the test device is not particularly limited, and may be determined according to the size of a specific thin film sample to be tested, and for example, the height of the test device may be 0.5m or more, preferably 0.8m or more, preferably 1.5m or more, preferably 1.8m or more, and the upper limit value of the height of the test device may be 5m or less, preferably 4.5m or less, preferably 4m or less, preferably 3.5m or less, preferably 3m or less, preferably 2.5m or less, preferably 2m or less. The height of the test device is most preferably 2-5m.
In the present invention, the manner in which the fixing clip 3 for fixing the film is fixed to the test stand 2 is not particularly limited, as long as the jaw of the fixing clip 3 can be prevented from rotating. The "upper portion" of the "fixing clip 3 is fixed to the upper portion of the test stand 2" is not particularly limited, and the position of the fixing clip 3 may be determined by the height of the test stand 2, the height of the stage 4, and the length of the thin film sample to be tested, for example, the height of the fixing clip 3 cannot be higher than the height of the test stand 2, the height of the fixing clip 3 cannot be lower than the height of the stage 4, and the distance between the lower end of the fixing clip 3 and the upper end of the stage 4 cannot be longer than the length of the thin film sample.
In the present invention, the height of the lower end of the fixing clip 3 from the upper surface of the base may vary widely, and may be determined according to the height of the entire test apparatus, for example, the height may be 0.4m or more, preferably 0.8m or more, preferably 1.5m or more, preferably 1.8m or more, and the upper limit value of the height of the test apparatus may be 5m or less, preferably 4.5m or less, preferably 4m or less, preferably 3.5m or less, preferably 3m or less, preferably 2.5m or less, preferably 2m or less. The height of the lower end of the fixing clip 3 from the ground is most preferably 1.7-4.5m.
In the present invention, the fixing clip 3 is provided with a jaw which can firmly clamp a film sample without slipping, the jaw is horizontal, the upper and lower sides of the jaw are parallel to each other, and the jaw cannot rotate. The type and material of the jaws may be chosen as is conventional in the art, for example, flat jaws, and the material may be metal. The width of the nip is not particularly limited, and may be selected according to the size of the film sample, and may be, for example, 5cm or more, preferably 8cm or more, preferably 10cm or more, preferably 12cm or more, preferably 15cm or more, preferably 20cm or more; preferably 40cm or less, preferably 38cm or less, preferably 35cm or less, preferably 32cm or less, preferably 30cm or less, and most preferably 25-30cm. The width of the jaws is the conventional meaning in the art and generally refers to the width of the gripping end surface.
According to the invention, the platform 4 has two functions, one of which is to provide support for the weight on the platform and the other of which is to provide support for the membrane strip of the membrane sample after the weight has been pushed down the platform. The thickness (distance between the upper and lower planes) of the stage 4 is not particularly limited as long as the above two functions can be achieved. The distance between the upper surface of the platform 4 and the lower end of the fixing clip 3 may be 0.35m or more, preferably 0.5m or more, preferably 1m or more, preferably 1.5m or more, preferably 4m or less, preferably 3.5m or less, preferably 3m or less, preferably 2.5m or less, and most preferably 0.35-4m.
In the present invention, the width of the platform 4 is not particularly limited as long as the above-described function can be achieved. The left-right width refers to the distance of the outer edge of the weight. The weight outer edge refers to the edge of the weight that is closer to the edge of the platform 4. The left-right width can be determined according to the size of the film sample to be tested, and the left-right width cannot be too large, otherwise the longitudinal tearing length of the film sample is too long, the tearing opening is likely to directly reach the position of the jaw, and otherwise the longitudinal tearing length of the film sample cannot be too short, or cannot be torn at all, and in both cases, the left-right width of the platform 4 is 0.2m or more, preferably 0.4m or more, preferably 0.5m or more, preferably 0.8m or more, preferably 1m or less, preferably 0.9m or less, which cannot effectively characterize the longitudinal tearing strength of the film. According to a preferred embodiment, the width of the platform 4 is 0.2-1m, more preferably 0.2-0.4m.
In the present invention, the front-rear width of the platform 4 is not particularly limited as long as the weight can be placed and the position of the weight 5 can be maintained on the same vertical plane as the fixing clip 3. The width of the platform 4 in the front-rear direction may be 0.1m or more, preferably 0.15m or more, preferably 0.2m or more, preferably 0.25m or more, may be 1m or less, may be 0.8m or less, may be 0.7m or less, may be 0.5m or less, may be 0.4m or less, and may be 0.3m or less.
In the present invention, the weights 5 are preferably located on the same vertical plane as the fixing clips 3, and the distance between the outer edges of the two weights is equal to the left-right width of the platform 4 and is flush with the edge of the platform 4.
In the invention, the left and right edges of the platform 4 are preferably chamfered, and the surfaces of the platform and the chamfer are smooth so as to reduce resistance during weight movement and reduce clamping. The angle of the chamfer is not particularly limited, and may be a conventional choice in the art, and may be, for example, 30 °, 45 °, or 60 °. Because of the plateau edge chamfer, the weight is flush with the plateau edge, which is understood to be flush with the edge of the plateau chamfer.
According to the invention, the mass of the weight 5 can vary widely, and the weight 5 is preferably a weight of 100-300g for the convenience of testing and error reduction. Preferably, the number of the weights is 2. In addition, the weight of the present invention is used to fix and pull the two film strips at the lower end of the film sample during the test, so that the weight of the present invention may be any object that can perform the fixing and pulling functions, and the volume of the object is as small as possible and can be regarded as a particle.
According to a preferred embodiment of the invention, the platform 4 and the retaining clip can be slid up and down for convenient testing of film samples of different desired dimensions. The vertical sliding means sliding performed to accommodate the sizes of different samples. Once the position of the clamp 3 and the platform 4 is determined during testing of the same batch or a certain film sample, it can no longer be moved.
According to the invention, the film sample of the test device can be prepared according to the following method:
(1) Cutting the film, wherein the long axis direction of the film is the machining direction;
(2) A transverse line mark is sequentially made at one end away from the long axis of the sample, and is called a mark A, a mark B and a mark C;
(3) Marking the film from a mid-position at mark B to a mid-position at the edge of the film along the long axis of mark C with a sharp blade or other suitable tool;
wherein, the positions of the marks A, B and C are positions on the film sample, the position of the mark A is a position clamped by a jaw, the position of the mark B is a starting position of longitudinal tearing, and the position of the mark C is a position fixed to the upper end of the weight.
According to the present invention, the kind of the film sample of the test device is not particularly limited, and any film requiring the test of the longitudinal tear strength may be prepared into the film sample. The method for preparing the film sample is not particularly limited, and the size of the film sample may be appropriately selected according to the size of the test device.
According to the present invention, a specific test method using the test apparatus may include the steps of:
(a) Clamping the film sample on the fixing clamp 3, clamping the jaw at the mark A to enable the other end of the sample to drop freely, and enabling the long axis direction of the film sample to be vertical;
(b) Tying left and right membrane strips at the lower end of the film sample to the upper ends of two weights along a transverse line marked at C;
(c) Simultaneously and instantaneously pushing down the two weights to opposite directions, wherein the time difference between the two weights leaving the platform is not more than 0.5s, and the swing amplitude of the weights after falling is not more than 10 degrees; the instantaneous speed is as high as possible, and the specific value is not particularly limited and may be, for example, more than 5m/s.
(d) The length of the film sample, in cm, was measured as the upward tear from the mark B.
Wherein, in the step (d), the maximum offset of the tearing trace of the film sample from the central axis of the sample is not more than 2mm;
wherein, the positions of the marks A, B and C are positions on the film sample, the position of the mark A is a position clamped by a jaw, the position of the mark B is a starting position of longitudinal tearing, and the position of the mark C is a position fixed to the upper end of the weight.
Wherein the position at a is flush with the lower end of the jaw of the fixing clip 3. In addition, the height of the platform 4 (the height from the ground, the same applies hereinafter) needs to satisfy the following requirements: the film sample A is fixed in the fixation clamp 3, and the C department of film sample is fixed in the left and right sides two weight upper ends of platform 4, and weight 5 should be on platform 4 this moment, and the outward flange parallel and level (if there is the chamfer then with the outward flange parallel and level of left and right chamfer) of platform 4 about the outward flange of weight 5, and weight 5 can not hang at the sky simultaneously, and film sample does not tear between A and B this moment. Alternatively, it will be appreciated that the appropriate film sample is selected for testing based on the height of the platform 4, the dimensions of the film sample being matched to the height of the platform 4, the location between the film sample and the platform 4 meeting the above requirements. In addition, in order to compare the longitudinal tearing properties of different batches or types of film samples or film samples at different positions in the same batch, the preparation methods of the film samples to be tested should be the same, and it makes sense to compare the results.
According to a preferred embodiment, the film sample of the test device is prepared by a method comprising the steps of:
(1) Cutting the film to obtain a sample with a rectangular shape and a size of 160×20cm, wherein the long axis direction is the machining direction, and the thickness of the film is 5+ -1 μm;
(2) Respectively marking a 10cm position, a 110cm position and a 140cm position at one end of a long axis of the sample by transverse lines, wherein the marks are called a mark A, a mark B and a mark C as shown in figure 2;
(3) Marking the film from a mid-position at mark B to a mid-position at the edge of the film along the long axis of mark C with a sharp blade or other suitable tool; the incision should be smooth and free of scores.
According to the present invention, a specific test method using the test apparatus may include the steps of:
(a) Clamping the film sample on the fixing clamp 3, clamping the jaw at the mark A to enable the other end of the sample to drop freely, and enabling the long axis direction of the film sample to be vertical;
(b) Tying left and right membrane strips at the lower end of the film sample to the upper ends of two weights along a transverse line marked at C;
(c) Simultaneously and instantaneously pushing down the two weights to opposite directions, wherein the time difference between the two weights leaving the platform is not more than 0.5s, and the swing amplitude of the weights after falling is not more than 10 degrees; the instantaneous speed is as high as possible, and the specific value is not particularly limited and may be, for example, more than 5m/s.
(d) The length of the film sample, in cm, was measured as the upward tear from the mark B.
Wherein the maximum offset of the film sample tear trace from the sample central axis in step (d) is no more than 2mm.
In the present invention, each batch of film samples was subjected to 4 tests of the longitudinal tear strength, and the average value was taken as the test result of the longitudinal tear strength of the film samples. The smaller the tear length of the film sample, the higher the machine direction tear strength.
One specific embodiment of the test apparatus for the longitudinal tear strength of a film according to the present invention is described below with reference to fig. 1.
As shown in fig. 1, the test apparatus includes:
(i) A base 1;
(ii) A test stand 2 perpendicular to the base 1 and fixed to the base 1, the total height of the base 1 and the test stand 2 being 2.0m;
(iii) The fixing clamp 3 is fixed at the upper part of the test frame 2 and is used for fixing a film sample, the fixing clamp 3 is provided with a jaw which can firmly clamp the film sample without slipping, the jaw is horizontal, the upper side and the lower side of the jaw are parallel, the jaw cannot rotate, the height of the lower end of the fixing clamp 3 from the ground is 1.7m, and the width of the jaw is 25cm;
(iv) The horizontal platform 4 is fixed on the test stand 2, the distance between the upper surface of the platform 4 and the lower end of the fixing clamp 3 is 1m, the left-right width of the platform 4 is 30cm, and the front-back width of the platform 4 is 20cm; the left and right edges of the platform 4 are chamfered, and the surfaces of the platform and the chamfer thereof are smooth;
(v) Two 200g weights placed on the platform 4 are positioned on the same vertical surface with the fixing clamp 3, and the outer edges of the two weights are separated by 28cm and are parallel and level with the edge of the platform.
The film is prepared by using an ultrathin mulching film LLDPE special material DFDA9020 produced by Tianjin petrochemical company. The specific process is as follows: the special material DFDA9020 was subjected to film blowing using a double-layer two-color mulch film machine set (product purchased from the company of shan head Jin Ming), the mulch film width was set to 900mm, the film thickness was set to 5 μm, and the above two parameters were stabilized for 1 hour and sampled as a test specimen to be tested.
Preparing a film sample by using the film obtained in the above process:
(1) Cutting the film to obtain a sample with a rectangular shape and a size of 160×20cm, wherein the long axis direction is the machining direction, and the thickness of the film is 5 μm;
(2) As shown in FIG. 2, the marks of transverse lines, namely mark A, mark B and mark C, are respectively made at the position 10cm, 110cm and 140cm from one end of the long axis of the sample;
(3) Marking the film from a mid-position at mark B to a mid-position at the edge of the film along the long axis of mark C with a sharp blade or other suitable tool; the incision should be smooth and free of scores.
The method for testing the longitudinal tearing strength of the film comprises the following steps:
(a) As shown in fig. 3, the film sample is clamped on the fixing clamp 3, the jaw is clamped at the mark A, the other end of the sample freely drops, and the long axis direction of the film sample is vertical;
(b) Tying left and right membrane strips at the lower end of the film sample to the upper ends of two weights along a transverse line marked at C;
(c) Simultaneously pushing down the two weights to the opposite directions at the speed of 10m/s, wherein the time difference between the two weights leaving the platform is not more than 0.5s, the swing amplitude after the weights fall is not more than 10 degrees, and the state after the weights are pushed down is shown in figure 4;
(d) The length of the film sample, in cm, was measured as the upward tear from the mark B.
Wherein the maximum offset of the film sample tear trace from the sample central axis in step (d) is no more than 2mm.
The test results are shown in Table 1.
TABLE 1
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (13)

1. A method for testing the longitudinal tear strength of a film, which is characterized in that the method is carried out in a testing device for testing the longitudinal tear strength of the film and comprises the following steps:
(a) Clamping the film sample on a fixing clamp (3), clamping a jaw at a mark A to enable the other end of the sample to drop freely, and enabling the long axis direction of the film sample to be vertical;
(b) Tying left and right membrane strips at the lower end of the film sample to the upper end of the weight (5) along a transverse line at the mark C;
(c) Simultaneously and instantaneously pushing down the two weights to opposite directions, wherein the time difference between the two weights leaving the platform is not more than 0.5s, and the swing amplitude of the weights after falling is not more than 10 degrees;
(d) Measuring the length of the film sample torn upward from the mark B in cm;
the positions of the marks A, B and C are positions on the film sample, the position of the mark A is a position clamped by a jaw, the position of the mark B is a starting position of longitudinal tearing, and the position of the mark C is a position fixed to the upper end of the weight;
the test device comprises:
(i) A base (1);
(ii) A test stand (2) perpendicular to the base (1) and fixed to the base (1);
(iii) A fixing clamp (3) fixed on the upper part of the test frame (2) and used for fixing the film sample;
(iv) A horizontal platform (4) fixed on the test stand (2); and
(v) And a weight (5) placed on the platform (4).
2. The test method according to claim 1, wherein the height of the test device is 0.5-5m.
3. A test method according to claim 1 or 2, wherein the holding clamp (3) is provided with jaws which can firmly clamp the film sample without slipping, the jaws are horizontal and the upper and lower sides of the jaws are parallel to each other, and the jaws cannot rotate.
4. A test method according to claim 3, wherein the jaw has a width of 5-40cm.
5. Test method according to claim 1 or 2, wherein the height of the lower end of the fixation clamp (3) from the ground is 0.4-5m.
6. Test method according to claim 1 or 2, wherein the distance of the upper surface of the platform (4) from the lower end of the fixing clip (3) is 0.35-4m.
7. The test method according to claim 1 or 2, wherein the width of the platform (4) is 0.2 to 1m, and the width of the platform (4) is 10cm or more in the front-rear direction.
8. Test method according to claim 1 or 2, wherein the weight (5) is positioned on the same vertical plane as the fixing clip (3).
9. Test method according to claim 1 or 2, wherein the outer edge of the weight (5) is equidistant from the left and right width of the platform (4) and is flush with the edge of the platform (4).
10. Test method according to claim 1 or 2, wherein the left and right edges of the platform (4) are chamfered and the surfaces of the platform and its chamfer are smooth.
11. Test method according to claim 1 or 2, wherein the weight (5) is a weight with a mass of 100-300 g.
12. Test method according to claim 1 or 2, wherein the number of weights (5) is 2.
13. The test method according to claim 1 or 2, wherein the test device comprises:
(i) A base (1);
(ii) A test stand (2) perpendicular to the base (1) and fixed on the base (1), wherein the total height of the base (1) and the test stand (2) is 2.0m;
(iii) The fixing clamp (3) is fixed at the upper part of the test frame (2) and is used for fixing a film sample, the fixing clamp (3) is provided with a jaw which can firmly clamp the film sample without slipping, the jaw is horizontal, the upper side and the lower side of the jaw are parallel to each other, the jaw cannot rotate, the height of the lower end of the fixing clamp (3) from the ground is 1.7m, and the width of the jaw is 25cm;
(iv) The horizontal platform (4) is fixed on the test frame (2), the distance between the upper surface of the platform (4) and the lower end of the fixing clamp (3) is 1m, the left-right width of the platform (4) is 30cm, and the front-back width of the platform (4) is 20cm; chamfering the left and right edges of the platform (4), and smoothing the surfaces of the platform and the chamfer thereof;
(v) Two 200g weights placed on the platform (4) are positioned on the same vertical surface with the fixing clamp (3), and the outer edges of the two weights are 28cm apart and are parallel and level with the edge of the platform.
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CN113049412B (en) * 2021-03-22 2024-02-06 嘉兴市升巍科技有限公司 Film body bearing deflection detection device for micro-nano optical film research and development and implementation method thereof

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